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collapseos
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16 Commits

Author SHA1 Message Date
Virgil Dupras 0b3f6253e4 forth: add support for IMMEDIATE words 2020-03-09 22:13:11 -04:00
Virgil Dupras 03bd9ee39b forth: make readCompWord read from RS' BOS instead of TOS 
Previous approach was broken with regards to defined word using CREATE.

Also, reduce name length by one to make space for a new flags field for
"immediate" (which isn't used yet).
 2020-03-09 19:50:51 -04:00
Virgil Dupras 0e8af3cea4 forth: clarify the meaning of "wordref" 
Also, make entry labels in dict.asm be wordref instead of entry ref.
 2020-03-09 15:12:44 -04:00
Virgil Dupras e8a4768304 forth: add words "IF", "ELSE", "THEN" 2020-03-09 14:19:51 -04:00
Virgil Dupras 03e529b762 forth: simplify execution model and handle literals better 
This scheme of "when we handle line-by-line, compile one word at a time then
execute" so that we could allow words like "CREATE" to call "readword" before
continuing was a bad scheme. It made things like branching outside of a colon
definition impossible.

This commit implement a new "litWord". When an undefined word is encountered at
compile time, it is included as-is in a string literal word. It is at run time
that we decide what to do with it.
 2020-03-09 14:14:26 -04:00
Virgil Dupras 5cadde557c forth: add "VARIABLE" 2020-03-07 22:23:08 -05:00
Virgil Dupras 989d8bbabf forth: add "DOES>" and "CONSTANT" 2020-03-07 22:18:14 -05:00
Virgil Dupras 53024d88f5 forth: add "DUP", "OVER", "SWAP", "?", "+!", "ALLOT" 2020-03-07 21:12:30 -05:00
Virgil Dupras f0cf10ab7c forth: Check for PS underflow 2020-03-07 20:20:11 -05:00
Virgil Dupras 580214426a forth: add +-*/ 2020-03-07 19:42:07 -05:00
Virgil Dupras ad2aca4620 forth: add number literals support 2020-03-07 19:25:55 -05:00
Virgil Dupras 30f188b984 forth: add word ":" 2020-03-07 18:54:16 -05:00
Virgil Dupras e7cd3182d0 forth: add words "CREATE", "@", "!", "HERE", "QUIT" 2020-03-07 17:09:45 -05:00
Virgil Dupras 6f9d28b325 forth: add word "bye" 
And make interpret action looping until BYE.
 2020-03-07 13:15:19 -05:00
Virgil Dupras 391ddb9984 forth: add word "." 2020-03-07 12:50:54 -05:00
Virgil Dupras 49228e418c apps/forth: new (WIP) application 2020-03-07 12:13:15 -05:00